I have an experimental DNA project at FTDNA looking at Y-DNA, mtDNA and autosomal DNA of those with Families in Rehoboth before 1750. If you a have previously tested there please join or if you plan on testing there in the future.
http://www.familytreedna.com/public/REHOBOTH/ I also have listings of names and places of origin for most Rehoboth Families. Please contact me for details.